Lake Wartook

Updated as of 2:59 PM 13 January 2021

Wartook Reservoir is located on the MacKenzie River in the central Grampians. It is the primary source of supply for Horsham and Natimuk, and a secondary source for Supply System 6 of the Wimmera Mallee Pipeline. The reservoir, which has a high recreational value, also provides important flows to the environment.

General Information

​Recreational fishing is popular at this lake.
Dogs are not permitted.

Recreational Activities

​Boating speed limit is 5 knots.
Swimming, water skiing, jet skis and camping are not permitted.
Duck shooting is not permitted.

Current Operating Status

Current Level 440.050 m AHD
Current Volume 15,310 ML
Percent Full 52%
Current Inflows -380 ML/week
24 hour Rainfall 0 mmCummulative Inflows Graph
Current Releases 25 ML/day
Current Spills 0 ML/day
Current Airspace 13,990 ML


  • Levels have fallen since last report.
  • Inflows to the reservoir have decreased since last report.
  • The reservoir is not currently spilling.


Full Supply Level 441.68 m AHD
Full Supply Volume 29,300 ML
Maximum Operating Volume 29,300 ML
Spillway Volume 441.83 m AHD
Spillway Length 175 m
Spillway Capacity 1,500 ML/day
Secondary Spillway Level 442.10 m AHD
Secondary Spillway Length 127 m
Secondary Spillway Capacity 25,056 ML/day
Outlet Capacity 500 ML/day
Catchment Area 75 km2
Surface Area When Full 10.31 km2
Major Tributary MacKenzie River
Average Annual Inflow 26,000 ML/year
Maximum Depth 8.2 m
Year Constructed 1887
AHD = Australian Height Datum, expressed in metres above mean sea level
ML = Megalitres